func is not a valid windows runtime parameter type (win 8.1)

Question

https://github.com/igorkulman/AutoCompleteBox/blob/master/AutoCompleteBox/AutoCompleteBox.cs

I download this control, But I cannot build it,

public Func<string, string, bool> SearchFunction
{
   get { return (Func<string, string, bool>)GetValue(SearchFunctionProperty); }
   set { SetValue(SearchFunctionProperty, value); }
}

When I try using SearchFunction as public,I am getting this error. When I change it as internal it is working but this time I can't access SearchFunction from my project.

Method 'CodeAutoComplete.AutoCompleteBox.SearchFunction.get()' has a parameter of type
 'System.Func<System.String, System.String, System.Boolean>' in its signature. Although 
this generic type is not a valid Windows Runtime type, the type or its generic parameters 
implement interfaces that are valid Windows Runtime types. Consider changing the type 
'System.Func<T1, T2, TResult>' in the method signature. It is not a valid Windows Runtime 
parameter type. C:\\..CodeAutoComplete\AutoCompleteBox.cs CodeAutoComplete (Windows 8.1)

What should I do?

Can you supply the definition for the method returned by `GetValue(SearchFunctionProperty)` ? — evanmcdonnal, Sep 23 '13 at 16:11

score 3 · Accepted Answer · answered Sep 23 '13 at 19:09

Instead of adding the file to a WindowsRuntimeComponent project, add it to Windows store class library (if you have already created the project you can change the output type to class library in project properties->Output type).
The problem is if you create a WindowsRuntime component, you are a lot more limited in what you can make public as everything you make public need to have a valid WindowsRuntime type mapping.

func is not a valid windows runtime parameter type (win 8.1)

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